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Simplifying 2(u + -3) = 5u + -21 Reorder the terms: 2(-3 + u) = 5u + -21 (-3 * 2 + u * 2) = 5u + -21 (-6 + 2u) = 5u + -21 Reorder the terms: -6 + 2u = -21 + 5u Solving -6 + 2u = -21 + 5u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-5u' to each side of the equation. -6 + 2u + -5u = -21 + 5u + -5u Combine like terms: 2u + -5u = -3u -6 + -3u = -21 + 5u + -5u Combine like terms: 5u + -5u = 0 -6 + -3u = -21 + 0 -6 + -3u = -21 Add '6' to each side of the equation. -6 + 6 + -3u = -21 + 6 Combine like terms: -6 + 6 = 0 0 + -3u = -21 + 6 -3u = -21 + 6 Combine like terms: -21 + 6 = -15 -3u = -15 Divide each side by '-3'. u = 5 Simplifying u = 5
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